$yh: "Microsoft yahei"; //字体参数

html {
  font-size: 62.5%;
  font-family: $yh;
  //rem 指的是页面的根节点html 的字体大小font-size
  font-size: calc(100vw / 7.5); // 移动端 适配    750:100 = 100vw:x  7.5:1 = 100vw:x  x =100vw/7.5
  font-size: -webket-calc(100vw/7.5); // 设计稿宽度  640px
}
body,
h1,
h2,
h3,
h4,
h5,
h6,
blockquote,
ol,
ul,
dl,
dd,
p,
textarea,
input,
select,
option,
form {
  margin: 0;
  padding: 0;
}
body {
  background: #f5f4f0;
  -webkit-tap-highlight-color: transparent;
  font-size: 16px;
}

ol,
ul,
textarea,
input,
option,
th,
td {
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: normal;
  font-size: 100%;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
menu,
nav,
section {
  display: block;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}
ul,
ol {
  list-style-type: none;
}
.clearfix:after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}
//.clearfix {*zoom:1;}
.clear {
  clear: both;
  height: 0;
  overflow: hidden;
}

input[type="text"],
textarea {
  -webkit-appearance: none;
}

input:focus {
  -webkit-user-modify: read-write-plaintext-only;
}
fieldset,
img {
  border: 0;
}
img {
  display: block;
}
a {
  text-decoration: none;
}
a,
textarea,
input {
  outline: none;
}
blockquote,
q {
  quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
  content: "";
  content: none;
}
textarea {
  overflow: auto;
  resize: none;
}
